Alan Wolke W2AEW is a true wizard. We are all lucky to be interested in homebrew radio at the same time that he is sharing his knowledge and wisdom
via YouTube. The ability of the NanoVNA to measure circuit impedances is,
in my mind, one of its most valuable features. With this, we can MEASURE input and output impedances. We can put bits and pieces of circuitry
together without wondering
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Frank Jones's 1936 Radio Handbook